Patent US4743896A successfully refreshed from Google Patents.
US4743896A
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Electrode pattern for a liquid crystal display
Assignee: Sharp Corp
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Filing: 1987-08-18
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Granted: 1988-05-10
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Expires: 2007-08-18
Abstract
Abstract An electrode pattern for a liquid crystal display comprises an electrode pattern having at least one dummy scan and/or signal electrode at a region other than a display pattern having true scan electrodes and true signal electrodes for displaying a specific display indicia. A circuit is provided for applying an OFF voltage to the dummy scan and/or signal electrode, the OFF voltage making this dummy electrode erased. The dummy electrodes are positioned and spaced in a manner identical to the true electrodes to simulate the overall appearance of the true electrode display region.
Inventors
- 👤 Sadakatsu Hashimoto
- 👤 Shintaro Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:17
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1343; G02F1/134309; G02F1/134336; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G2310/00; G09G2310/02; G09G2310/0232
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
429 words
A matrix display panel comprising: first and second spaced apart non-conductive substrates; an active display material disposed between said first and second substrates; a plurality of active display scan electrodes disposed on said first substrate, arranged in parallel and spaced apart from each other by a first predetermined distance; a plurality of active display signal electrodes disposed on said second substrate, arranged in parallel and spaced apart by a second predetermined distance, each of said active display signal electrodes orthogonally intersecting each of said active displat scan electrodes; P1 the orthogonally intersecting portions of said active display signal electrodes and active display scan electrodes defining an active display portion of said panel, said panel further including a visible non-display portion; a plurality of dummy display scan electrodes disposed on said first substrate in said non-display portion of said panel, a plurality of said dummy display scan electrodes being arranged adjacently with each other and in parallel to said active display scan electrodes in each of a top and a bottom portion of said visible non-display portion having said active display portion therebetween and being spaced apart from each other and from said active display scan electrodes; a plurality of dummy display signal electrodes disposed on said second substrate in said non-display portion of said panel, a plurality of said dummy display signal electrodes being arranged adjacently with each other and in parallel to said active display signal electrodes in each of first and second side portions of said visible non-display portion having said active display portion therebetween and being spaced apart from each other and from said active display signal electrodes; said dummy display signal electrodes being commonly connected together, said dummy display scan electrodes being also commonly connected together; said active display scan electrodes and dummy display scan electrodes being uniformly distributed across said first substrate over the entirety of said active display portion and non-display portion of said panel; said active display signal electrodes and dummy display signal electrodes being uniformly distributed across said second substrate over the entirety of said active display portion and non-display portion of said panel; said active display scan and display signal electrodes being driven to develop a desired pattern on said active display portion of said panel, nonenergized portions of said active display portion having their corresponding active display scan electrodes and active display signal electrodes being driven with an erase waveform; said dummy display signal electrodes and said dummy display scan electrodes being continuously driven by said erase waveforms to develop an appearance equivalent to nonenergized portions of said display.
Claim 2
Dependent Claim
429 words
A matrix display panel comprising: first and second spaced apart non-conductive substrates; an active display material disposed between said first and second substrates; a plurality of active display scan electrodes disposed on said first substrate, arranged in parallel and spaced apart from each other by a first predetermined distance; a plurality of active display signal electrodes disposed on said second substrate, arranged in parallel and spaced apart by a second predetermined distance, each of said active display signal electrodes orthogonally intersecting each of said active displat scan electrodes; P1 the orthogonally intersecting portions of said active display signal electrodes and active display scan electrodes defining an active display portion of said panel, said panel further including a visible non-display portion; a plurality of dummy display scan electrodes disposed on said first substrate in said non-display portion of said panel, a plurality of said dummy display scan electrodes being arranged adjacently with each other and in parallel to said active display scan electrodes in each of a top and a bottom portion of said visible non-display portion having said active display portion therebetween and being spaced apart from each other and from said active display scan electrodes; a plurality of dummy display signal electrodes disposed on said second substrate in said non-display portion of said panel, a plurality of said dummy display signal electrodes being arranged adjacently with each other and in parallel to said active display signal electrodes in each of first and second side portions of said visible non-display portion having said active display portion therebetween and being spaced apart from each other and from said active display signal electrodes; said dummy display signal electrodes being commonly connected together, said dummy display scan electrodes being also commonly connected together; said active display scan electrodes and dummy display scan electrodes being uniformly distributed across said first substrate over the entirety of said active display portion and non-display portion of said panel; said active display signal electrodes and dummy display signal electrodes being uniformly distributed across said second substrate over the entirety of said active display portion and non-display portion of said panel; said active display scan and display signal electrodes being driven to develop a desired pattern on said active display portion of said panel, nonenergized portions of said active display portion having their corresponding active display scan electrodes and active display signal electrodes being driven with an erase waveform; said dummy display signal electrodes and said dummy display scan electrodes being continuously driven by said erase waveforms to develop an appearance equivalent to nonenergized portions of said display.
Claim 3
Dependent Claim
15 words
The panel of claim 1 wherein said active display material is a liquid crystal material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |